Hibiscus

Question

Every year my hibiscus plants develop circular black spots on the leaves. They yellow, turn brown and fall off. It doesn’t seem to hurt the blossoms though.

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Answer 1

This sounds like it could be a mild fungal infection. I would suggest using a fungicide on the upper portions of the shrub. This article will help: https://www.gardeningknowhow.com/garden-how-to/info/using-fungicides-in-garden.htm

I would also treat the soil with a handful of DOLOMITIC LIME and a teaspoon of WETTABLE SULFUR once or twice each year. This will help to prevent the issue in the future.

This article will help you to grow Hibiscus: https://www.gardeningknowhow.com/ornamental/flowers/hibiscus/how-to-care-for-hibiscus-plants.htm